Seems to me that if the AI writes the code, then AI can easily copy the code.

I.e. how hard is it to point an AI at a piece of software and say "AI, copy this"?

Seems like sooner or later copying just becomes a matter of spending enough on tokens.

Seems in that world, all significant software projects get copied. That turns software into a commodity loss leader for other business models or an open source project. Similar to the way Chrome works for Google and the way Firefox works.